The SS AMERICAN MARINER arrived in port with...

Question 1 / 2066636eec28f7522a1c51cb5d

Question 1 of 2066636eec28f7522a1c51cb5d

Load 120 tons---210 feet fwd of amidships Discharge 350 tons---40 feet fwd of amidships Load 340 tons---60 feet aft of amidships Discharge 60 tons---190 feet aft of amidships

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Question 1 of 20

66636eec28f7522a1c51cb5d

Load 120 tons---210 feet fwd of amidships Discharge 350 tons---40 feet fwd of amidships Load 340 tons---60 feet aft of amidships Discharge 60 tons---190 feet aft of amidships

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🔍 Key Concepts

• Use the Stability Data Reference Book – SS AMERICAN MARINER, Sheet 2 to get displacement, TPI (tons per inch immersion), and the trim correction factors at the ship’s initial mean draft. • Treat each load/discharge as a separate trimming moment about amidships/LCF, using: tons × distance (forward = one sign, aft = the opposite sign). • Separate the effect of change of mean draft (net weight on/off) from the change of trim (longitudinal moments), then combine them to get final forward and aft drafts.

💭 Think About

• What is the ship’s initial mean draft and corresponding displacement/TPI from Sheet 2 before cargo work starts? • After you compute the algebraic sum of tons and of tons×distance, how do you convert the total trimming moment into inches of trim using the data on Sheet 2? • Once you know the total change in mean draft and total trim in inches, how do you split that trim between the forward and aft drafts based on the position of LCF relative to amidships?

✅ Before You Answer

• Make sure you keep a consistent sign convention: choose forward moments as plus and aft as minus (or vice versa) and stick with it for all four cargo operations. • Verify that you used the correct hydrostatic values at the initial mean draft (not at the final draft) from Sheet 2 – especially TPI and the trim factor/MT1". • After finding tentative final drafts, check that the change in displacement matches the net cargo loaded/discharged and that the sense of trim (by the head or by the stern) agrees with the net trimming moment.

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Question 1 of 20

The SS AMERICAN MARINER arrived in port with drafts of: FWD 18'-05", AFT 20'-11". Cargo was loaded and discharged as indicated in table ST-0114 below. Use sheet 2 in the white pages of the Stability Data Reference Book to determine the final drafts. Load 120 tons---210 feet fwd of amidships Discharge 350 tons---40 feet fwd of amidships Load 340 tons---60 feet aft of amidships Discharge 60 tons---190 feet aft of amidships

FWD 18'-11", AFT 20'-07"

FWD 18'-07", AFT 20'-11"

FWD 18'-09", AFT 20'-09"

FWD 19'-01", AFT 20'-05"

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Question 1 / 2066636eec28f7522a1c51cb5d

Question 1 of 2066636eec28f7522a1c51cb5d

Load 120 tons---210 feet fwd of amidships Discharge 350 tons---40 feet fwd of amidships Load 340 tons---60 feet aft of amidships Discharge 60 tons---190 feet aft of amidships

Back

Question 1 of 20

66636eec28f7522a1c51cb5d

Load 120 tons---210 feet fwd of amidships Discharge 350 tons---40 feet fwd of amidships Load 340 tons---60 feet aft of amidships Discharge 60 tons---190 feet aft of amidships

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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